Topic Content:
- Definition of Work
- Definition of Power
- Calculations Involving Power
- Watt Converter
- Definition of Energy
What is Work?
Work can be defined as the product of force and distance through which an object moves in the direction of force applied.
Work (W) = Force (F) × distance (D)
= Newton × metre
= Joule (J)
∴ 1 J = 1 Nm
If the object doesn’t move, then no work is done.
Where Force is the product of mass and gravity or mass and acceleration (F = mg, or F = ma) (g = 10 m/s2)
The unit of work is Joule named after the scientist, James Prescott Joule, who did a lot of experiments with energy.
In the illustration above, the work done is the product of the force (12N) used to push the box and the distance (5m).
= 12 N × 5 m = 60 J
Joules Converter:
Larger units are KiloJoule (KJ) and MegaJoule (MJ)
1,000 Joules (J) = 1 KiloJoule (KJ)
1,000,000 Joules (J) = 1 MegaJoule (MJ)
1,000 KiloJoules (KJ) = 1 MegaJoule (MJ)
Example 1
If a force of 20 N is used to pull a Wheelbarrow through a distance of 8 m. How much work is done in the process.
You are viewing an excerpt of this Topic. Subscribe Now to get Full Access to ALL this Subject's Topics and Quizzes for this Term!
Click on the button "Subscribe Now" below for Full Access!
Subscribe Now
Note: If you have Already Subscribed and you are seeing this message, it means you are logged out. Please Log In using the Login Button Below to Carry on Studying!
Impressive
Amazing. Thanks a lot for this